Good time BB, you're improving!
This week I inadvertently did 75m crawl without a "breast break" (not as enjoyable as it sounds); I'm nowhere near keeping it going for 500m.
I wouldn't like to take credit for any of the tips, nor indeed would I vouch for any of them being correct. There seems to be contradictory advice out there.
I'm wondering whether it's better to look straight down after all. I did try the body roll and it somehow felt unnatural yet helpful. I also tried reaching down low towards the bottom of the pool on the pull. I don't know whether that's right or not, but it increased my roll.
So, as I was saying, I can't vouch for these tips. In fact I just did another google and came up with
this, which looks like a good site, but states "We suggest you avoid thumb-first entry like the plague". OK, scratch that one then.
They're big on body roll though.